[llvm] [AMDGPU] Generate s_absdiff_i32 (PR #164835)

[via llvm-commits]

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+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc -mtriple=amdgcn-amd-amdpal -mcpu=gfx900 < %s | FileCheck %s
+
+define amdgpu_ps i32 @absdiff_v1(i32 inreg %arg, i32 inreg %arg2) {
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LU-JOHN wrote:

Tested <2 x i32> and <4 x i32>

https://github.com/llvm/llvm-project/pull/164835